Curves after calibration

Using a brightness of 140 cd/m^2 was found to produce an abrupt non-linearity in the very bright areas (sharp flattening of the curve), which is best avoided. A brightness of 120 cd/m^2 as shown above avoided this issue entirely as the curve shows.

Toggle to view uncalibrated vs calibrated.

Color gamut after calibration

After calibration, the NEC EA244UHD shows a color gamut far in excess of Adobe RGB in the red and magenta range as well as greater gamut in the green and blue range. Excellent.